Discharge of clear fluid from penis.

Im a 23 yr old guy. My problem - For the past 5 years there is a disharge of precum (the water like tranparent fluid) after every time I urinate. This doesnt happen immediately after urination but a few minutes later, maybe after 20 mins or 30mins. The discharge is only a small drop. sometimes I feel the slow sensation of fluid flowing in the urethra, but sometimes I dont feel. I come to know only by the white stain on my underwear. And also whenever I feel the urge to urinate its very urgent. I mean the urge is very strong. I need to rush to the toilet. Normally this strong urge is experienced in winter or when a lot of water is drunk. But for me its always like this. For this reason I used to drink less water. My lips and tongue became very dry so I started drinking more water. Now I needed to urinate more frequently than before and I feel a burning sensation at the tip of th penis. And the urine is white and clear everytime except early in the morning. If I drink less water my eyes also become dry and I feel like my eyelids are rubbing on my retina. I feel like fainting. I have a doubt that my kidneys are not capable of processing a large quantity of water or my bladder is weak. And for the fluid discharge- I think my parasympathetic nerve might have become weak, since I masturbate very frequently (twice a week) but I dont know what to do. Im very frustrated with these problems and Im very much worried about my married life. I`ve not married yet. Please help me with these problems and suggest any cheap medicines or a home remedy would be even better. I will be very greatful to you.